6.4 regens vary greatly based upon driving conditions and use/load ect.

What "I" average is 300-400 between regens unloaded and around 90-130 when towing heavy.

Typically you can expect more frequent regens if you drive alot of city/stop and go miles vs hwy miles.

The PCM will command a regen at around 630 miles if no regen was required before then.

Manual would not indicate that info..that is a learned event. It would only say it happens to regenerate the DPF.

 

Regen frequency also depend a lot on your driving behaviour. Lots of cold weather operation, lots of soot events all fill up the DPF and require cleaning more frequently.

I regen once every 200~250 miles in mixed empty driving. Regens won't start until the coolant is >160F and take anywhere from 12-45minutes to complete depending on how hot the exhaust can get. Since our engines take a while to heat up, short trips of less than 20-30 minutes are usually not good for a regen cycle to complete. If terminated early, regen will try to restart the next time the DPF fills up. Straight freeway shots under load with constant throttle are best.

Stop-and-go city traffic is something you want to avoid while regening..it'll suck your tank dry. Generally speaking, the longer the DPF can sit above 1000-1100F, the sooner soot will all burn off.. Regens are shut down whenever the truck is put in idle or neutral

This is something we have to learn to work with on these rigs . I have to carefully plan my trips if at all possible when I know I'm due for a regen :-(

 

Regen doesn't start till the truck is warmed up, so if it's running fine cold, I bet theres an issue keeping it from going into regen, and the engine goes into reduced power mode.

Betting on a sensor myself.

 

Codes were : p2452 and p040d . My goes into regen a lot . I drained some oil out this morning and replaced exhaust pressure sensor and I thought it was cured but it still loses about 50% power sometimes .

 

P040D X X X

Exhaust Gas Recirculation

Temperature Sensor

A Circuit High

This error occurs when the EGR cooler inlet sensor

temperature output value is lower (higher voltage

signal) than a minimum probable temperature,

indicating an open circuit or short to power.

N > 650 rpm

torque setpoint >53 N-m

ECT > 60 deg C

4.65v >5sec

Wiring, Tegr_IN sensor, PCM

 

P2452 Diesel Particulate Filter Pressure Sensor "A" Circuit D* DPFP-A

 

I think if you figure out why you are making oil that will help. I'd start there. Do an oil change. If your oil grows...then check injectors..fuel lines.

 

P040D - Exhaust Gas Recirculation Temperature (EGRT) Sensor A Circuit High
<table border="1" cellpadding="3" cellspacing="0"> <tbody> <tr> <th align="center" valign="bottom">
</th> <th align="center" valign="bottom">
</th> <th align="center" valign="bottom">
</th> <th align="center" valign="bottom">
</th> <th align="center" valign="bottom">
</th></tr> <tr> <td style="BORDER-RIGHT: medium none" align="left" valign="top">Description: </td> <td style="BORDER-LEFT: medium none" colspan="4" align="left" valign="top">When the EGRT sensor signal is higher than the specified value, an increment counter advances until the DTC is set. </td></tr> <tr> <td style="BORDER-RIGHT: medium none" align="left" valign="top">Possible Causes: </td> <td style="BORDER-LEFT: medium none" colspan="4" align="left" valign="top">

• EGCIT circuit short to voltage
• EGCIT circuit open
• EGRT sensor

</td></tr> <tr> <td style="BORDER-RIGHT: medium none" align="left" valign="top">Diagnostic Aids: </td> <td style="BORDER-LEFT: medium none" colspan="4" align="left" valign="top">This DTC is set when the EGRT sensor signal voltage is greater than 4.65 volts for greater than 5 seconds. </td></tr> <tr> <td style="BORDER-RIGHT: medium none" align="left" valign="top">Application </td> <td style="BORDER-LEFT: medium none" align="left" valign="top">
</td> <td align="center" valign="top">Key On Engine Off </td> <td align="center" valign="top">Key On Engine Running </td> <td align="center" valign="top">Continuous Memory </td></tr> <tr> <td style="BORDER-RIGHT: medium none" align="left" valign="top">All </td> <td style="BORDER-LEFT: medium none" align="left" valign="top">
</td> <td colspan="3" align="center" valign="top">GO to Pinpoint Test WA . </td></tr></tbody></table>
P2452 - Diesel Particulate Filter Pressure Sensor A Circuit
<table border="1" cellpadding="3" cellspacing="0"> <tbody> <tr> <th align="center" valign="bottom">
</th> <th align="center" valign="bottom">
</th> <th align="center" valign="bottom">
</th> <th align="center" valign="bottom">
</th> <th align="center" valign="bottom">
</th></tr> <tr> <td style="BORDER-RIGHT: medium none" align="left" valign="top">Description: </td> <td style="BORDER-LEFT: medium none" colspan="4" align="left" valign="top">The powertrain control module (PCM) monitors the rationality of the diesel particulate filter pressure sensor during idle and part load operating conditions. The test fails when the diesel particulate filter pressure sensor signal value at idle is less than 0.15 kPa (0.022 psi). The test also fails when the diesel particulate filter pressure sensor signal value at part load is less than a minimum value or greater than a maximum value. These minimum and maximum values are based on the volume of exhaust. </td></tr> <tr> <td style="BORDER-RIGHT: medium none" align="left" valign="top">Possible Causes: </td> <td style="BORDER-LEFT: medium none" colspan="4" align="left" valign="top">

• Diesel particulate filter pressure sensor connecting hose is loose, cracked, or missing
• Diesel particulate filter pressure sensor connecting hose port is cracked or broken
• Excessive amount of soot or ash in the diesel particulate filter
• Damaged diesel particulate filter pressure sensor

</td></tr> <tr> <td style="BORDER-RIGHT: medium none" align="left" valign="top">Diagnostic Aids: </td> <td style="BORDER-LEFT: medium none" colspan="4" align="left" valign="top">Carry out a thorough inspection of the diesel particulate filter pressure sensor and connecting hose. If DTC P2463 is present along with DTC P2452, diagnose DTC P2463 first.

</td></tr></tbody></table>

 

Great info , thanks . What is code " p2463 ? I seen that in your manual but didn't get that code when I pulled my codes .

 

Also when I pulled out exhaust pressure sensor "a" it was covered in diesel fuel and soot , there's know way it could have sent a accurate signal to PCM . Just an opinion though .

 

<table class="ADVV1-HotlineArchives-Whites" cellpadding="0" cellspacing="0"><tbody><tr><td class="ADVV1-HotlineArchives-LeftRuledRows">
</td> <td class="ADVV1-HotlineArchives-RuledRows">
<table class="ADVV1-HotlineArchives-Whites" cellpadding="0" cellspacing="0"><tbody><tr><td class="ADVV1-HotlineArchives-LeftRuledRows">Customer Concern: </td> <td class="ADVV1-HotlineArchives-RuledRows"> The engine lacks power, it appears the turbo is not working. There is a hard fault code P040D that will not clear.

</td></tr></tbody></table>Tests/Procedures:
1. EGR and exhaust gas temperature sensor codes will many times put the PCM into "limp" mode. Fix this code before further diagnosis.

2. Access the EGR temperature sensor A for circuit tests. The sensor is mounted in the exhaust pipe that connects to the rear of the Right Hand (RH) exhaust manifold. The harness connector should be near the rear of the RH valve cover just forward of the rear engine lifting bracket. The sensor is normally easier to access through the wheelwell.

3. At the two pin connector, the Brown wire is the 5 volt reference to the sensor. The Green and White wire is the ground for the sensor. The code P040D suggests the voltage on the sensor exceeds 4.65 volts.

4. Leave the connector plugged in, turn the key on, backprobe the Brown wire with your volt meter. If the voltage exceeds 4.65 volts, backprobe a good ground to the Green and White wire.

5. If the voltage comes down with a ground supplied to the Green and White wire, repair the ground circuit or pin.

6. If the voltage remains above 4.65 volts, suspect an open EGT sensor or bad connection.

looks like EGR Temperature Sensor A is very common for code P040D


</td></tr></tbody></table>